Thoracic back support



FIG. 1 is a perspective view of a thoracic back support.

FIG. 2 is a top view of the thoracic back support.

FIG. 3 is a bottom view of the thoracic back support.

FIG. 4 is a front view of the thoracic back support.

FIG. 5 is a back view of the thoracic back support.

FIG. 6 is a right view of the thoracic back support; and,

FIG. 7 is a left view of the thoracic back support.

The broken lines are for the purpose of illustrating the environment ofthe design only and form no part of the claimed design.

The ornamental design for a thoracic back support, as shown anddescribed.